This does not fail on trunk.foswiki.org, and MTempest also reports it's working fine. However it is failing for me on a git checkout, and also on a Release11RC install on a live site.

Not a bug. This is a configuration error. When using short URL's, you have to remember to set $Foswiki::cfg{ScriptUrlPaths}{view} = ''; I've missed setting this now on two sites. Maybe we need a checker or change parameter from expert to normal, so it is visible as a reminder.